Northern Ireland's three listed companies have witnessed their share prices plummet as markets fell following a narrow vote for the UK to exit the EU.

Belfast software firm Kainos fell more than 10%, while Newry's First Derivatives closed more than 7% down.

Wireless Group also fell, but rallied before the close, ending 0.5% up.

Meanwhile, Stormont's Finance Minister Mairtin O Muilleoir said he would "act resolutely to protect the interests of all our people, especially against further austerity".

Glyn Roberts of the Northern Ireland Independent Retail Trade Association said Westminster "needs to produce a roadmap of a new trading arrangement with the EU single market".

Stephen Kelly of Manufacturing NI said while "some are calling for calm and pointing to a two or three year process to sort it out" that "business won't and isn't waiting as demonstrated by these calls". And officials in the Republic are to embark on trade missions to Northern Europe, the US, China and India to combat any impact of the Brexit.